| 摘要 |
<p>A non-destructive apparatus for inspection of cargo containing trucks (17), cargo containers, and the like uses a source (11) of high energy radiation, e.g., a fan beam of X-rays having energies about 8 MeV. The beam passes through the materials (cargo) to be inspected and strikes a first detector directly aligned with the beam. A second detector adjacent the first detector receives X-rays from the source (11) which are forward scattered from the materials being inspected at a small angle, e.g., 4° to 10°. The detectors (21) are preferably vertical arrays aligned with a vertical fan beam shaped by collimators (13, 19). Collimators limit the field of view of the first and second detectors (21) to a common spatial location, typically one that is fixed.</p> |
